21212023232120 has 128 divisors (see below), whose sum is σ = 54852182985600. Its totient is φ = 7231771238400.

The previous prime is 21212023232117. The next prime is 21212023232167. The reversal of 21212023232120 is 2123232021212.

It is a happy number.

It is a super-2 number, since 2×21212023232120² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 758614940 + ... + 758642900.

It is an arithmetic number, because the mean of its divisors is an integer number (428532679575).

Almost surely, 2^{21212023232120} is an apocalyptic number.

21212023232120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212023232120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27426091492800).

21212023232120 is an abundant number, since it is smaller than the sum of its proper divisors (33640159753480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212023232120 is a wasteful number, since it uses less digits than its factorization.

21212023232120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43129 (or 43125 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21212023232120 its reverse (2123232021212), we get a palindrome (23335255253332).

The spelling of 21212023232120 in words is "twenty-one trillion, two hundred twelve billion, twenty-three million, two hundred thirty-two thousand, one hundred twenty".